java下载zip文件
java下载zip文件
1.参考API可见,Java的JDK中提供一个java.util.zip的接口。其压缩过程主要是通过这两个接口压缩文件或者文件夹;
- java.util.zip.ZipEntry;
- java.util.zip.ZipOutputStream;
2.功能实现
1)页面请求方式:
window.location.href = "/file/do_upload;
2) web端实现
- @RequestMapping("/do_upload")
- public void test(HttpServletResponse response, String taskId) throws IOException {
- long start = System.currentTimeMillis();
- // 获取附件信息
- List<File> files = fileService.listAllFiles(fileId);
- //判断是否为excel类型文件
- if(CollectionUtils.isEmpty(files)) {
- LOGGER.error("查询无关联图片或者视频");
- } else {
- // 设置文件名
- formatFileName(response, task);
- ZipOutputStream zos = null;
- try {
- zos = new ZipOutputStream(response.getOutputStream());
- for (File srcFile : files) {
- if (StringUtils.isNotEmpty(srcFile.getFileHbasePath()) && StringUtils.isNotEmpty(srcFile.getFileName())) {
- // 下载附件
- byte[] bytes = fastDFSService.downloadFile(srcFile.getFileHbasePath());
- byte[] buf = new byte[1024];
- zos.putNextEntry(new ZipEntry(srcFile.getFileName()));
- int len;
- ByteArrayInputStream in = new ByteArrayInputStream(bytes);
- while ((len = in.read(buf)) != -1){
- zos.write(buf, 0, len);
- }
- zos.closeEntry();
- }
- }
- long end = System.currentTimeMillis();
- System.out.println("压缩完成,耗时:" + (end - start) +" ms");
- } catch (Exception e) {
- throw new RuntimeException("zip error from ZipUtils",e);
- }finally{
- if(zos != null){
- try {
- zos.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
- }
- }
设置文件名字和响应信息设置
- /**
- * @methodname formatFileName
- * @Description {设置响应信息和格式化附件名字}
- * @author admin
- */
- private void formatFileName(HttpServletResponse response) throws UnsupportedEncodingException {
- String fileName = "附件文字";
- Long actualEndTime = new Date().getTime();
- fileName += actualEndTime + ".zip";
- // 获取浏览器信息
- if (request.getHeader("User-Agent").toLowerCase().indexOf("firefox") > 0) {
- fileName = new String(fileName.getBytes("GB2312"),"ISO-8859-1");
- } else {
- // 处理中文文件名的问题
- fileName = java.net.URLEncoder.encode(fileName, "UTF-8");
- fileName = new String(fileName.getBytes("UTF-8"), "GBK");
- }
- // 清除首部的空白行
- response.reset();
- // 设置Response容器的编码
- response.setCharacterEncoding("UTF-8");
- // 不同类型的文件对应不同的MIME类型
- response.setContentType("application/x-msdownload");
- response.setHeader("Content-Disposition","attachment; filename="+fileName);
- }
参考原文地址:
获取游览器信息:https://blog.csdn.net/w410589502/article/details/73163383
压缩文件:https://blog.csdn.net/yunyingxiaoyi/article/details/103407789
https://blog.csdn.net/wjbltxx/article/details/119938101